package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.BaseException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车业务层
 */
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetmealMapper setmealMapper;

    /**
     * 添加购物车业务逻辑
     *
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断是否有数据
        //根据条件查询 购物车中是否有同样的数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.selectByCondition(shoppingCart);
        //null  添加
        if (shoppingCartList != null && shoppingCartList.size() == 1) {  //不为null 加过  数量+1   更新
            ShoppingCart cart = shoppingCartList.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.update(cart);
            return;
        }
        //判断是 菜
        if (shoppingCart.getSetmealId() == null) {
            //根据菜品id 查询菜的其他数据
            Long dishId = shoppingCart.getDishId();
            Dish dish = dishMapper.selectById(dishId);
            //组织新的数据
            shoppingCart.setName(dish.getName());
            shoppingCart.setImage(dish.getImage());
            shoppingCart.setAmount(dish.getPrice());
        } else {//套餐
            //根据套餐id 查询 套餐的其他数据
            Long setmealId = shoppingCart.getSetmealId();
            Setmeal setmeal = setmealMapper.selectById(setmealId);
            //组织新的数据
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
        }
        //设置数量为1
        shoppingCart.setNumber(1);
        //设置添加时间
        shoppingCart.setCreateTime(LocalDateTime.now());
        //插入到数据库
        shoppingCartMapper.insert(shoppingCart);


    }

    @Override
    public List<ShoppingCart> list() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.selectByCondition(shoppingCart);
        return shoppingCartList;
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //判断是否有数据
        //根据条件查询 购物车中是否有同样的数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.selectByCondition(shoppingCart);
        //null
        if (shoppingCartList != null && shoppingCartList.size() == 1) {  //不为null 加过  数量+1   更新
            ShoppingCart cart = shoppingCartList.get(0);
            //如果是最后一个 执行 删除
            if (cart.getNumber() == 1) {
                shoppingCartMapper.deleteById(cart.getId());
                return;
            }
            //-1
            cart.setNumber(cart.getNumber() - 1);
            shoppingCartMapper.update(cart);
        }else {
            throw new BaseException("商品不存在");
        }

    }
}
